Hollow composite beam using dual-web and construction method thereof

Patent metadata

Field	Value
Publication number	US-11326345-B2
Application number	US-201916691529-A
Country	US
Kind code	B2
Filing date	Nov 21, 2019
Priority date	Nov 23, 2018
Publication date	May 10, 2022
Grant date	May 10, 2022

Abstract

Provided are a hollow composite beam using a dual-web and a construction method thereof. The hollow composite beam using a dual-web can secure space efficiency using a tendon installed in an internal space of a dual-web and can efficiently adjust a tensioning force using the tendon anchored by an anchoring wedge and a separable bolt, wherein the dual-web is formed as a web of a steel beam having a bottom flange on which a deck plate is supported.

First claim

What is claimed is:

1. A hollow composite beam using a dual-web, comprising:
a dual-web formed by two inclined plates to form an internal space between a lower surface of a top flange of a steel beam and an upper surface of a bottom flange of the steel beam, wherein the two inclined plates continuously extend in a length direction of the hollow composite beam;
an anchoring unit configured to tense two end portions of a tendon, which is disposed to extend in the internal space in the length direction of the hollow composite beam, using the two inclined plates and anchor the two end portions of the tendon using a tendon anchoring part,
wherein the anchoring unit comprises an internal groove formed to communicate with an anchorage hole, and wherein an anchoring wedge is anchored in the anchorage hole and comprises a bolt hole that is a horizontal hole extending to be externally exposed through an upper surface and an inside of the anchoring wedge and a fastening part formed in a middle of the bolt hole; and
a separable bolt having a bolt-body part inserted into the bolt hole formed in the anchoring wedge so that a portion at which a front end part is formed is exposed to the internal groove, wherein the bolt-body part is a rod member having a fastener formed in a middle of the rod member and fastened with the fastening part of the anchoring wedge to move in a screwing manner while rotating,
wherein the separable bolt inserted into the anchoring wedge rotates to allow the anchoring wedge to be separable from the anchorage hole.

2. The hollow composite beam of claim 1 , wherein the tendon anchoring part comprises:
two anchoring vertical plates that extend downward from a central lower surface of the top flange and are spaced apart from each other so that two end portions of the two anchoring vertical plates extend to end surfaces of the two inclined plates and are hung; and
a tendon supporting plate formed on a lower portion between the two anchoring vertical plates so that the tendon does not come out downward from between the two anchoring vertical plates, wherein the tendon is positioned between the two anchoring vertical plates.

3. The hollow composite beam of claim 2 , wherein the tendon anchoring part further comprises an end surface-transverse fixing element having a central portion fastened with the two anchoring vertical plates between which the tendon is positioned and the two end portions are also fastened with the two inclined plates so that the tendon is stably settable.

4. The hollow composite beam of claim 1 , wherein the anchoring unit comprises:
a head part formed such that the anchorage hole is tapered and passes through the head part;
a bolt part that is inserted into a through hole formed in an object to be anchored and is integrated with the head part; and
a fixing nut allowing the bolt part to be fixedly fastened to the object to be anchored,
wherein the tendon is disposed to pass through the anchorage hole and the bolt part, and the anchoring wedge is anchored in the anchorage hole.

5. The hollow composite beam of claim 4 , wherein the anchoring wedge comprises a plurality of wedge pieces disposed to surround the tendon and the bolt hole formed in one of the wedge pieces as the horizontal hole, and the separable bolt is inserted into the bolt hole formed in the one of the wedge pieces so that a front end part is exposed to the internal groove.

6. The hollow composite beam of claim 5 , wherein the separable bolt comprises:
a bolt-body part inserted into the bolt hole formed in the anchoring wedge as a rod member so that a portion at which the front end part is formed is exposed to the internal groove;
the front end part which is assembled to a front end portion of the bolt-body part as an expanding flange and allows an area in which a front surface of the front end part is in contact with an inclined internal surface of the internal groove to increase so as to support rotation movement of the separable bolt; and
a fastener that rotates while being fastened to the fastening part of the anchoring wedge to move the anchoring wedge in a screwing manner so that the anchoring wedge is separated from the anchorage hole.

7. The hollow composite beam of claim 6 , wherein, in the separable bolt, a rotating nut that allows a head part of the bolt-body part to be fixed to the anchoring wedge is integrally assembled to the head part of the bolt-body part,
wherein the rotating nut is accommodated in a groove foil led in an upper end portion of the one of the wedge pieces, and the anchoring wedge allows the tendon to be anchored in the anchorage hole, wherein the tendon comprises a wire rope.

8. A method of constructing a hollow composite beam using a dual-web, comprising:
constructing a hollow composite beam which comprises a dual-web formed by two inclined plates to form an internal space between a lower surface of a top flange of a steel beam and an upper surface of a bottom flange of the steel beam, wherein the two inclined plates continuously extend in a length direction of the hollow composite beam, and an anchoring unit configured to tense two end portions of a tendon, which is disposed to extend in the internal space in the length direction of the hollow composite beam, using the two inclined plates and anchor the two end portions of the tendon using a tendon anchoring part; and
installing a plurality of deck plates on the bottom flange of the hollow composite beam, arranging slab reinforcement bars, and pouring slab concrete on the plurality of deck plates to construct a composite floor system,
wherein the anchoring unit comprises an internal groove formed to communicate with an anchorage hole, and wherein an anchoring wedge is anchored in the anchorage hole and comprises a bolt hole that is a horizontal hole extending to be externally exposed through an upper surface and an inside of the anchoring wedge and a fastening part formed in a middle of the bolt hole,
wherein the hollow composite beam further comprises a separable bolt having a bolt-body part inserted into the bolt hole formed in the anchoring wedge so that a portion at which a front end part is formed is exposed to the internal groove, wherein the bolt-body part is a rod member having a fastener formed in a middle of the rod member and fastened with the fastening part of the anchoring wedge to move in a screwing manner while rotating,
wherein the separable bolt inserted into the anchoring wedge rotates to allow the anchoring wedge to be separable from the anchorage hole.

Assignees

• Korea Inst Civil Eng & Building Tech

Inventors

• Kim Heung Youl
• Cho Bum Yeon

Classifications

• E04C3/06 Primary

  with substantially solid, i.e. unapertured, web (E04C3/10, E04C3/11 take precedence {honeycomb girders E04C3/083}) · CPC title

• E04C5/122

  the tensile members are anchored by wedge-action · CPC title

• E04C3/10

  prestressed · CPC title

• E04C3/293 Primary

  the materials being steel and concrete (concrete with internal reinforcements or tensioning members E04C3/20) · CPC title

• E04B5/29

  the prefabricated parts of the beams consisting wholly of metal (E04B5/28 takes precedence) · CPC title